Firewall rules are duplicated and not deleted

[marcus67]

Current state: In some (currently unknown) situations the firewall rule entries blocking traffic for a client are not deleted. Instead, there is a growing number of entries which will stay indefinitely, basically permanently blocking the user's PC. Even a restart of LittleBrother will not help since upon exit only one entry will be deleted.

Desired state: The mechanism should be more robust with respect to duplicated entries in the firewall rule table. When the restriction for a client is removed, ALL existing entries should be removed and not just one.